/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.ignite.internal.cli.core.exception;

import java.io.PrintWriter;

/**
 * Writer for exception error messages.
 */
public interface ExceptionWriter {
    /**
     * Write provided exception message.
     *
     * @param errMessage error message.
     */
    void write(String errMessage);

    /**
     * Helper mapper.
     *
     * @param pw {@link PrintWriter} instance.
     * @return {@link ExceptionWriter} instance based on {@param pw}.
     */
    static ExceptionWriter fromPrintWriter(PrintWriter pw) {
        if (pw != null) {
            return pw::println;
        } else {
            return nullWriter();
        }
    }

    static ExceptionWriter nullWriter() {
        return fromPrintWriter(new PrintWriter(PrintWriter.nullWriter()));
    }
}
